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The best way to understand what a hook does is to look at where it occurs in the source code.
do_action( "hook_name" )apply_filters( "hook_name", "what_to_filter" ).Remember, this hook may occur in more than one file. Moreover, the hook's context may change from version to version.
| Line | Code |
|---|---|
| 4102 | $new = implode("\n", $pung); |
| 4103 | |
| 4104 | /** |
| 4105 | * Filter the new ping URL to add for the given post. |
| 4106 | * |
| 4107 | * @since 2.0.0 |
| 4108 | * |
| 4109 | * @param string $new New ping URL to add. |
| 4110 | */ |
| 4111 | $new = apply_filters( 'add_ping', $new ); |
| 4112 | |
| 4113 | // expected_slashed ($new). |
| 4114 | $new = wp_unslash($new); |
| 4115 | return $wpdb->update( $wpdb->posts, array( 'pinged' => $new ), array( 'ID' => $post_id ) ); |
| 4116 | } |
| 4117 | |
| 4118 | /** |
| 4119 | * Retrieve enclosures already enclosed for a post. |
| 4120 | * |